Study And Development Of CAD System Of PDC Bit With Pro/ENGINEER Workbench

The PDC bit's design theory develops quickly in our country in recent years, but it still has a big gap compared with foreign countries. So it is very necessary that applying the advanced CAD technique to improve the design means.We choose Pro/ENGINEER as the secondary development environment and make use of its secondary development tool Pro/TOOLKIT in conjunction with VC++6.0 programming, develop the "PDC bit CAD system" software. Under 3D environment, design and analysis functions of PDC bit are as follows:(1) Crown design, realizing three kinds of theoretical design models such as equivalent cutting volume, equivalent wear and equivalent power during PDC bit drilling and four kinds of curve fitting means such as straight line-arc-straight line, straight line-arc-parabola, straight line-arc and straight line-parabola to design crown entity.(2)Cutter distribution design, realizing four kinds of cutter distribution methods such as equivalent spiral line, varied spiral line, equivalent distance and varied distance. This means can realize continuous cutter distribution design at the vertical gauge-protection segment or when we don't know curve's equation.(3) Junk slot design, realizing vertical junk slot with extrude method by picking the 3D points of junk slot on solid directly.(4) Nozzle distribution design, picking the 3D placement points of nozzle on solid directly and adjusting position parameter, direction parameter freely, it will display the axis direction of nozzle momentarily.(5) Automatic assembling cutter and automatic creating the cutter's slot structure in crown.(6) Putting forward the analytical method of "measuring cutting parameters" under Pro/TOOLKIT environment and realizing the function of automatic measuring cutting area, cutting arc length and cutting volume during PDC bit drilling .(7) Realizing the analytical function of simulating PDC cutter's drilling well bottom and the interference analysis between well bottom and cutter.It can speed up designing and increase the quality of PDC bit design by making use of this software. Because of the software running under the Pro/ENGINEER 3D environment, it also builds a solid base for the PDC bit's CAE/CAM.